I'm in Queensland. Do I need to change to the renewable photographic high risk work (HRW) licence? If so when?

YES. If you hold any of the licence classes that fall under the national standard, you will need to change them over to a renewable and photographic licence. Licences are being changed over a period of five years from 2008–2012.
If you do not convert to the new high risk work (HRW) licence by the conversion date (ie your birthday), your old licence will expire and you will be unable to use it until issued with your new HRW licence.
The date that you will need to convert to a high risk work licence will depend on the date of the last class added to your licence, which will then be aligned with your birth date.For example:

Date of issue of licence or date of most recent endorsement on the licence